Ordovician shale and limestoneDecember 17, 2014/in /by Marli Miller Ordovician shale and limestone, northern Kentucky, guard rail, guardrail https://geologypics.com/wp-content/uploads/2017/04/geologic-time-pics-logo-300x115.png 0 0 Marli Miller https://geologypics.com/wp-content/uploads/2017/04/geologic-time-pics-logo-300x115.png Marli Miller2014-12-17 03:00:212019-07-02 03:49:15Ordovician shale and limestone
